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linux/fs/cifs
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Stefano Brivio 729c0c9dd5 cifs: Fix stack out-of-bounds in smb{2,3}_create_lease_buf() 
smb{2,3}_create_lease_buf() store a lease key in the lease
context for later usage on a lease break.

In most paths, the key is currently sourced from data that
happens to be on the stack near local variables for oplock in
SMB2_open() callers, e.g. from open_shroot(), whereas
smb2_open_file() properly allocates space on its stack for it.

The address of those local variables holding the oplock is then
passed to create_lease_buf handlers via SMB2_open(), and 16
bytes near oplock are used. This causes a stack out-of-bounds
access as reported by KASAN on SMB2.1 and SMB3 mounts (first
out-of-bounds access is shown here):

[  111.528823] BUG: KASAN: stack-out-of-bounds in smb3_create_lease_buf+0x399/0x3b0 [cifs]
[  111.530815] Read of size 8 at addr ffff88010829f249 by task mount.cifs/985
[  111.532838] CPU: 3 PID: 985 Comm: mount.cifs Not tainted 4.18.0-rc3+ #91
[  111.534656] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1 04/01/2014
[  111.536838] Call Trace:
[  111.537528]  dump_stack+0xc2/0x16b
[  111.540890]  print_address_description+0x6a/0x270
[  111.542185]  kasan_report+0x258/0x380
[  111.544701]  smb3_create_lease_buf+0x399/0x3b0 [cifs]
[  111.546134]  SMB2_open+0x1ef8/0x4b70 [cifs]
[  111.575883]  open_shroot+0x339/0x550 [cifs]
[  111.591969]  smb3_qfs_tcon+0x32c/0x1e60 [cifs]
[  111.617405]  cifs_mount+0x4f3/0x2fc0 [cifs]
[  111.674332]  cifs_smb3_do_mount+0x263/0xf10 [cifs]
[  111.677915]  mount_fs+0x55/0x2b0
[  111.679504]  vfs_kern_mount.part.22+0xaa/0x430
[  111.684511]  do_mount+0xc40/0x2660
[  111.698301]  ksys_mount+0x80/0xd0
[  111.701541]  do_syscall_64+0x14e/0x4b0
[  111.711807]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[  111.713665] RIP: 0033:0x7f372385b5fa
[  111.715311] Code: 48 8b 0d 99 78 2c 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 66 78 2c 00 f7 d8 64 89 01 48
[  111.720330] RSP: 002b:00007ffff27049d8 EFLAGS: 00000206 ORIG_RAX: 00000000000000a5
[  111.722601] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f372385b5fa
[  111.724842] RDX: 000055c2ecdc73b2 RSI: 000055c2ecdc73f9 RDI: 00007ffff270580f
[  111.727083] RBP: 00007ffff2705804 R08: 000055c2ee976060 R09: 0000000000001000
[  111.729319] R10: 0000000000000000 R11: 0000000000000206 R12: 00007f3723f4d000
[  111.731615] R13: 000055c2ee976060 R14: 00007f3723f4f90f R15: 0000000000000000

[  111.735448] The buggy address belongs to the page:
[  111.737420] page:ffffea000420a7c0 count:0 mapcount:0 mapping:0000000000000000 index:0x0
[  111.739890] flags: 0x17ffffc0000000()
[  111.741750] raw: 0017ffffc0000000 0000000000000000 dead000000000200 0000000000000000
[  111.744216] raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[  111.746679] page dumped because: kasan: bad access detected

[  111.750482] Memory state around the buggy address:
[  111.752562]  ffff88010829f100: 00 f2 f2 f2 f2 f2 f2 f2 00 00 00 00 00 00 00 00
[  111.754991]  ffff88010829f180: 00 00 f2 f2 00 00 00 00 00 00 00 00 00 00 00 00
[  111.757401] >ffff88010829f200: 00 00 00 00 00 f1 f1 f1 f1 01 f2 f2 f2 f2 f2 f2
[  111.759801]                                               ^
[  111.762034]  ffff88010829f280: f2 02 f2 f2 f2 f2 f2 f2 f2 00 00 00 00 00 00 00
[  111.764486]  ffff88010829f300: f2 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[  111.766913] ==================================================================

Lease keys are however already generated and stored in fid data
on open and create paths: pass them down to the lease context
creation handlers and use them.

Suggested-by: Aurélien Aptel <aaptel@suse.com>
Reviewed-by: Aurelien Aptel <aaptel@suse.com>
Fixes: b8c32dbb0d ("CIFS: Request SMB2.1 leases")
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
2018-07-05 13:48:25 -05:00
..
asn1.c treewide: kmalloc() -> kmalloc_array() 2018-06-12 16:19:22 -07:00
cache.c vfs: change inode times to use struct timespec64 2018-06-05 16:57:31 -07:00
cifs_debug.c smb3: do not display empty interface list 2018-06-15 02:38:08 -05:00
cifs_debug.h cifs: add server argument to the dump_detail method 2018-05-27 17:56:35 -05:00
cifs_dfs_ref.c
cifs_fs_sb.h smb3: fix redundant opens on root 2018-05-27 17:56:35 -05:00
cifs_ioctl.h
cifs_spnego.c
cifs_spnego.h
cifs_unicode.c
cifs_unicode.h
cifs_uniupr.h
cifsacl.c treewide: kmalloc() -> kmalloc_array() 2018-06-12 16:19:22 -07:00
cifsacl.h cifs: For SMB2 security informaion query, check for minimum sized security descriptor instead of sizeof FileAllInformation class 2018-06-04 19:19:24 -05:00
cifsencrypt.c cifs: Fix invalid check in __cifs_calc_signature() 2018-06-15 19:17:40 -05:00
cifsfs.c smb3: do not allow insecure cifs mounts when using smb3 2018-06-07 08:36:39 -05:00
cifsfs.h cifs: update internal module version number for cifs.ko to 2.12 2018-05-27 17:56:35 -05:00
cifsglob.h cifs: Fix stack out-of-bounds in smb{2,3}_create_lease_buf() 2018-07-05 13:48:25 -05:00
cifspdu.h
cifsproto.h cifs: Fix use after free of a mid_q_entry 2018-07-05 13:48:24 -05:00
cifssmb.c cifs: Fix infinite loop when using hard mount option 2018-07-05 13:48:25 -05:00
connect.c cifs: Fix use after free of a mid_q_entry 2018-07-05 13:48:24 -05:00
dir.c some smb3 fixes for stable, as well as addition of ftrace hooks for cifs.ko, and improvements in compounding and smbdirect (RDMA) 2018-06-04 14:42:46 -07:00
dns_resolve.c
dns_resolve.h
export.c
file.c treewide: kzalloc() -> kcalloc() 2018-06-12 16:19:22 -07:00
fscache.c vfs: change inode times to use struct timespec64 2018-06-05 16:57:31 -07:00
fscache.h
inode.c smb3: Fix mode on mkdir on smb311 mounts 2018-06-15 02:38:08 -05:00
ioctl.c
Kconfig IB: remove redundant INFINIBAND kconfig dependencies 2018-05-09 08:51:03 -04:00
link.c cifs: fix a buffer leak in smb2_query_symlink 2018-06-07 23:39:41 -05:00
Makefile smb3: Add ftrace tracepoints for improved SMB3 debugging 2018-05-27 17:56:35 -05:00
misc.c CIFS: add iface info to struct cifs_ses 2018-06-15 02:38:08 -05:00
netmisc.c cifs: update calc_size to take a server argument 2018-05-27 17:56:35 -05:00
nterr.c
nterr.h
ntlmssp.h
readdir.c cifs: update calc_size to take a server argument 2018-05-27 17:56:35 -05:00
rfc1002pdu.h
sess.c
smb1ops.c cifs: Fix use after free of a mid_q_entry 2018-07-05 13:48:24 -05:00
smb2file.c cifs: Fix stack out-of-bounds in smb{2,3}_create_lease_buf() 2018-07-05 13:48:25 -05:00
smb2glob.h cifs: remove struct smb2_hdr 2018-06-01 09:14:30 -05:00
smb2inode.c cifs: fix a buffer leak in smb2_query_symlink 2018-06-07 23:39:41 -05:00
smb2maperror.c cifs: remove struct smb2_hdr 2018-06-01 09:14:30 -05:00
smb2misc.c smb3: fix corrupt path in subdirs on smb311 with posix 2018-06-15 02:38:08 -05:00
smb2ops.c cifs: Fix stack out-of-bounds in smb{2,3}_create_lease_buf() 2018-07-05 13:48:25 -05:00
smb2pdu.c cifs: Fix stack out-of-bounds in smb{2,3}_create_lease_buf() 2018-07-05 13:48:25 -05:00
smb2pdu.h cifs: Fix stack out-of-bounds in smb{2,3}_create_lease_buf() 2018-07-05 13:48:25 -05:00
smb2proto.h cifs: fix SMB1 breakage 2018-07-05 13:48:24 -05:00
smb2status.h
smb2transport.c cifs: Fix validation of signed data in smb2 2018-07-05 13:48:24 -05:00
smbdirect.c cifs: fix SMB1 breakage 2018-07-05 13:48:24 -05:00
smbdirect.h cifs: fix SMB1 breakage 2018-07-05 13:48:24 -05:00
smbencrypt.c
smberr.h
smbfsctl.h
trace.c smb3: Add ftrace tracepoints for improved SMB3 debugging 2018-05-27 17:56:35 -05:00
trace.h smb3: Fix mode on mkdir on smb311 mounts 2018-06-15 02:38:08 -05:00
transport.c cifs: fix SMB1 breakage 2018-07-05 13:48:24 -05:00
winucase.c
xattr.c